My optimus s earpiece quit working for like the fifth time. I've took my phone into sprint several times. They have replace the ear piece, and factory reset my phone. After factory reset it has worked fine for around three months, until today. Sprint tech has told me its an app doing it. After they reset it I put the same Apps back on it, and it was fine for 3 months. Any thoughts? This phone worked great until stupid android update, since then its junk.